package com.stone.dosql.struts.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse; 

public class SetCharacterEncodingFilter implements Filter { 
	protected String encoding = null; 
	
	protected FilterConfig filterConfig = null; 
	
	protected boolean ignore = true; 
	
	public void destroy() { 
		this.encoding = null; 
		this.filterConfig = null; 
	} 

	public void doFilter(ServletRequest request, ServletResponse response, 
	FilterChain chain) throws IOException, ServletException { 
	
		// Conditionally select and set the character encoding to be used 
		if (ignore || (request.getCharacterEncoding() == null)) { 
		String encoding = selectEncoding(request); 
		if (encoding != null) 
		request.setCharacterEncoding(encoding); 
		} 
		
		// Pass control on to the next filter 
		chain.doFilter(request, response); 
	
	} 

	public void init(FilterConfig filterConfig) throws ServletException { 
	
		this.filterConfig = filterConfig; 
		this.encoding = filterConfig.getInitParameter("encoding"); 
		String value = filterConfig.getInitParameter("ignore"); 
		if (value == null) 
		this.ignore = true; 
		else if (value.equalsIgnoreCase("true")) 
		this.ignore = true; 
		else if (value.equalsIgnoreCase("yes")) 
		this.ignore = true; 
		else 
		this.ignore = false; 
	
	} 

	protected String selectEncoding(ServletRequest request) { 
		return (this.encoding); 
	} 

} 
